20
15 13 12 11 18 14 20 17 16 19 
13 17 18 20 19 16 15 12 11 14 
11 20 16 18 13 12 17 14 19 15 
15 18 13 17 11 14 12 20 19 16 
19 11 17 20 16 15 18 12 13 14 
16 17 11 12 20 15 18 19 14 13 
12 11 13 18 15 20 14 19 16 17 
17 19 18 15 20 14 11 12 16 13 
13 20 15 18 11 16 17 12 14 19 
11 20 14 18 16 13 15 12 19 17 
3 6 1 8 9 5 4 7 2 10 
8 9 1 6 2 3 10 4 7 5 
9 4 6 7 8 2 5 1 10 3 
8 5 4 2 1 10 7 9 3 6 
9 5 2 1 7 10 4 8 6 3 
9 10 6 3 2 5 1 7 8 4 
7 4 1 3 5 6 9 8 10 2 
7 10 1 4 9 5 8 6 3 2 
2 6 3 9 7 5 8 4 1 10 
3 7 6 4 8 10 9 1 5 2 
forbidden 1 13
forbidden 1 16
forbidden 2 11
forbidden 2 15
forbidden 2 20
forbidden 3 11
forbidden 3 12
forbidden 3 16
forbidden 4 13
forbidden 4 14
forbidden 4 18
forbidden 5 11
forbidden 5 12
forbidden 5 13
forbidden 5 15
forbidden 6 11
forbidden 6 14
forbidden 7 14
forbidden 7 16
forbidden 7 18
forbidden 7 20
forbidden 8 12
forbidden 8 13
forbidden 8 14
forbidden 8 18
forbidden 8 19
forbidden 9 14
forbidden 9 18
forbidden 10 17
forbidden 10 19